The tools like the magnetic lasso tool and stuff works great when you
need to remove a background, but it doesn’t always works great around
the hair of someone. So, here is an easier way which works great!

This is the image that I will be using:

Go to Filter – Extract. With the Edge Highlighter tool, trace around the edge of the person:

Now with the fill tool, click on the person to fill it.

Click Ok

If there is little parts of the picture that were removed, go over it with your history brush!
Done!
Easy isn’t it?